﻿using SuperQuiz.Common;

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using SuperQuiz.Logic;

// The Grid App template is documented at http://go.microsoft.com/fwlink/?LinkId=234226

namespace SuperQuiz
{
    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App : Application
    {
        /// <summary>
        /// Initializes the singleton Application object.  This is the first line of authored code
        /// executed, and as such is the logical equivalent of main() or WinMain().
        /// </summary>
        public App()
        {
            this.InitializeComponent();
            this.Suspending += OnSuspending;
        }

        async protected override void OnSearchActivated(SearchActivatedEventArgs args)
        {
            await QuizApplication.Instance.LoadAsync();

            if (Window.Current.Content == null)
            {
                var rootFrame = new Frame();
                SuspensionManager.RegisterFrame(rootFrame, "AppFrame");
                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    await QuizApplication.Instance.RestoreAsync();
                    await SuspensionManager.RestoreAsync();
                }

                if (rootFrame.Content == null)
                {
                    if (!rootFrame.Navigate(typeof(HomePage), null))
                    {
                        throw new Exception("Failed to create initial page");
                    }
                }
                Window.Current.Content = rootFrame;
            }
            Window.Current.Activate();

            ((Frame)Window.Current.Content).Navigate(typeof(SearchResults), args.QueryText);
        }

        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used when the application is launched to open a specific file, to display
        /// search results, and so forth.
        /// </summary>
        /// <param name="args">Details about the launch request and process.</param>
        protected override async void OnLaunched(LaunchActivatedEventArgs args)
        {
            QuizApplication.Instance.Initialize();
            QuizApplication.Instance.LoadAsync();

            // Do not repeat app initialization when already running, just ensure that
            // the window is active
            if (args.PreviousExecutionState == ApplicationExecutionState.Running)
            {
                Window.Current.Activate();
                return;
            }

            // Create a Frame to act as the navigation context and associate it with
            // a SuspensionManager key
            var rootFrame = new Frame();
            SuspensionManager.RegisterFrame(rootFrame, "AppFrame");

            if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
            {
                // Restore the saved session state only when appropriate
                await QuizApplication.Instance.RestoreAsync();
                await SuspensionManager.RestoreAsync();
            }

            if (rootFrame.Content == null)
            {
                Type homePageType = typeof(HomePage);
                string homePageParameter = null;
                if (QuizApplication.Instance.HomePageType != null)
                {
                    homePageType = QuizApplication.Instance.HomePageType;
                    homePageParameter = QuizApplication.Instance.HomePageParameter;
                }

                if (!rootFrame.Navigate(homePageType, homePageParameter))
                {
                    throw new Exception("Failed to create initial page");
                }
            }

            // Place the frame in the current Window and ensure that it is active
            Window.Current.Content = rootFrame;
            Window.Current.Activate();
        }

        /// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private async void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();
            await QuizApplication.Instance.SaveAsync();
            await SuspensionManager.SaveAsync();
            deferral.Complete();
        }
    }
}
